Automatic stop



March 4, 1930. D. 5. WASHINGTON 1,749,172

AUTOMATIC STOP Filed Nov. 30. 1927 2 Sheets-Sheet l March /4, 1930. D, ws m ToN 1,749,172

AUTOMATIC STOP g Filed Nov. 30, 1927 2 Sheets-Sheet 2 &

I1 VVENTOR hm 51011 I e fit n 930 a m 1,749,172-

- f N ED I STATES" "oi-"Pics 7 m E. wAsnnve'ron, or kgnsnserr MISSQUBI TIf Appl ication 'filed Novemher3th'1 927 Serial No. 236,871.

, This invention relates to automatic stop operate as quioklyafter thereversal of moveand has for-its primary ohject the provision inent asispossible. y .of a-device adaptedto beaflixed to a rotating vAccordingly this invention contemplates shaft in such a manner that thereversal from .aseries of elements forming one embodiment 5 the normaldirection of. travel of said shaft the invention which may consist ef a,55

'will'cause the stop to operate and'preclude ratchet wheel 8vhaving thecustomaryteeth any damage which might have resulted from .9, inclined inthe proper. direction to allow suchreversal. had this stopnot been inplace. unobstructed rotation of shaft 7 in its inor- The primary objectof this invention is .inall directioni s [1 to provide astop which is 7positive in its; As is .clearly shown in Fig. 4, ratchet 8 is v .actionwill operate immediately upon the rerigidly secured to shaft 7 throughthe inter- ,t versal ofthe shaft and which 'has'means for mediacyof akey orflthe like 10', thus it is permitting a gradual reversal after theoper- .ohvious that ratchet Swill always travel with -ative parts have"been moveolto the shaft shaft .a'nd through thisratchetsh'aftTwill Q1stopping position. i c 7 I a Y be stopped:when thefdirection of rotationis 65 'A still further object of t e present inven- -;rever sed to theydirection opposite from nort-io'nis' the provision of an automatic stopanal. I I J which isused in combination with a rotating o fulfill thisrequirement of the invention, shaftwhich stop is provided with aratcheta housing -12= is provided within which is Wand cam positioned inpixtaposition whereby pivotallymounted upon shaft '13 a .dogle 70 theslight movement of the cam will cause adapted ;to,engage the teeth 9 ofthe ratchet 's tops'dogs tofaH into-operative relation with 8 when thedevice moves to the operative po- 3 "Ftheratchet; Other objects ofthisinvention sition. As shaftl'lis moving in the normal y will appearduring the course of the detailed jidirection, dogs 14 are maintainedout of .en-

specification referring to the accompanying tgagernentwith ratchet 8 .byajcam 1 5 which "drawings wherein a 'isiprovided withthe;pr0perfaceslfitoengage Figure 1 is a sideelevation of the auto-.overhanging'portion l7 of-the dog 14. matio stop and made in accordancewith this Y As is plain .to, be seen in Fig. steam 15 is inventionshowing'the same anchored in place maintained in engagement with thesideof upon a shaft adapted to be rotated. ratchet 8 by a plurality ofspring actuated Fig. 2 is a top-plan-view of the same asit pins'18andthe movement imparted to cam 15 v is shown in Fig; v ,by ratchet 8may be limited through the use 1 j Fig. 3 is a vertical section of thestop. 1 'of'pins 1;9, carried1hy housing 12 andpro- Fig. e'is avertic alcrosssection of the same jec-ting through their respective openings 20 V3 taken on line IV -IV ofFig. 3. formed through the wall of cam'15." .85

Fig.5 is an enlarged detailed section, show- I 1'1e-ferring to Fig. 3and to the description ing the operative and inoperative relation ofjust aho.ve" set forth; it will-be obvious that dog'and ratchet, and Vas the shaft 7 rotates in the direction offlthe [Fig 6 is anotherenlarged detailed section arro'w ratchet 8;,willurgecam 15 inthe same fltaken' on line VI-VI ofFigxB. direction so that openings 20 will lie inthe w r. Similar reference characters refer to like relative positionwith pins 19 as illustrated. partsthroughout the-several viewsand the pes 14 will beheld {up byca n .faces' 16 numeral '7 designates a shaftcapable of rolasjsfhown immediatelyuponthe 'i eversal tation'pand upon"which this device is to be "of shaft t am 15 will travel with shaft'and used- P V I i fratchet 7 and '8 respectively until P lls l9 lie 1"j'Shaft 7 "normally. rotates in the direction of againstthe side ofopenings 20 at a' point dio the arrow shownin Fig. 3 and since this stoprectly diametricallyopposite to that shown is'use'd in conne'ctioirwitha device where *in" 3. 'YVhen' this position is reached,

, reversal of the shaftwill cause serious dam-v ,odogs lewill hereleasedto the actionof greyage, it is des red to have a StOP WhlCh w ll9 of the ratchet 8. Obviouslythis connection between shaft and ratchetand the hous- 7 ing 12 will be sudden and solid. Shaft 7 will bearrested by the direct ability of thedogs 14. Theload stoppedisoftentimes heavy and before readjustment may be aflected,

' shaft 7 must be reversed. When the dogs are locked'tight the Wholemechanism within and including housing 12 must be allowed to slowlyreverse.-

One form of embodiment this phase of the invention is shown'here to bean ordi naryvbrake band 20 which may be formed in segments and heldagainst thew-outer periphery of housing 12 through the use of Isegmental clamps 21. These clamps 21 are ual reversal of the housingand'shaft when the dog moves to the ratchet engaging position.

signature. 7 n V I DIXONE l VAsI-IINGToN.

in turn engaged by anchoringv barso22 and" the necessary amount of giveor slide,' in a reversed direction, may be provided for 12 within thisanchoring and clamping mechanism.

The operation of this device, has been made i clear'through thespecification and while one important embodiment of the invention has ibeen illustrated and-described, it is desired to be limited in theconstruction and usefof only by the accompanying this invention clalms.

7 What Iclaim as new and'desireto secure by Letters'Patent is: s

1. In combination with a frotatable shaft,

a stop therefor comprising a ratchet, a h'ousing'for the ratchet, aplurality of dogs, a I" cam adjacent saidyratchet having faces to holdlsaid' dog s out of engagement with the ratchet and'means holding saidstop in the operative position adapted to permit gradual reversal of thehousing and shaft when the. o

dogs move to the ratchet engaging position;

2. In combination with a rotatable shaft,

a stop therefor comprising a ratchet, a hous V I ing for the ratchet, adog, a cam adjacent said ratchet having a face-for holding-said dog outof engagement with said ratchet,

means to yieldably maintain said cam in frictional engagement with saidratchet, a L

V slot in said cam, and a pin on said housing 'for engaging said slot toprovide a lost motion connection between said cam andhouscombinationowith a rotatable shaft, I

a stop therefor comprising a ratchet, a hou's-j means tolyieldablymaintain said cam in frictional engagementwith said ratchet, a

ingfor the ratchet, a dog, a cam adjacent said ratchet having afaceforholding'said" dog out of engagement-With said ratchet,

braking. device engaging'theperiphery of i said housing for 'holdingsaidstopin the operative position and for permitting grad- In testimonywhereof I hereunto afiix my I

